package com.fly.core.security.validate.code;

import com.fly.core.security.properties.SecurityProperties;
import com.fly.core.security.validate.code.imageCode.ImageCode;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.social.connect.web.HttpSessionSessionStrategy;
import org.springframework.social.connect.web.SessionStrategy;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

/**
 * 每次请求过滤一次
 * 验证码
 */
//@Component("validateCodeFilter")
public class ValidateCodeFilter extends OncePerRequestFilter implements InitializingBean {
    /**
     * 验证码校验失败处理器
     */
    @Autowired
    private AuthenticationFailureHandler authenticationFailureHandler;

    private SecurityProperties securityProperties;
    private Set<String> urls = new HashSet<>();
    private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();
    //路径匹配
    private AntPathMatcher pathMatcher = new AntPathMatcher();

    @Override
    public void afterPropertiesSet() throws ServletException {
        super.afterPropertiesSet();
        // 分隔符拆分
        String[] configUrls = StringUtils.splitByWholeSeparatorPreserveAllTokens(securityProperties.getValidateCode().getImage().getUrl(), ",");
        for (String configUrl : configUrls) {
            urls.add(configUrl);
        }
        urls.add("/authentication/form");
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        boolean action = false;
        for (String url : urls) {
            if (pathMatcher.match(url,request.getRequestURI())){
                action = true;
            }
        }
//        if (StringUtils.equals("/authentication/form", request.getRequestURI()) && StringUtils.equalsIgnoreCase(request.getMethod(), "post")) {
        if (action) {
            try {
                validate(new ServletWebRequest(request));
            } catch (ValidateCodeException e) {
                //失败
                authenticationFailureHandler.onAuthenticationFailure(request, response, e);
                return;
            }
        }
        filterChain.doFilter(request, response);
    }

    private void validate(ServletWebRequest request) throws ServletRequestBindingException {
        ImageCode codeInSession = (ImageCode) sessionStrategy.getAttribute(request,ValidateCodeController.SESSION_KEY);
        String codeInRequest = ServletRequestUtils.getStringParameter(request.getRequest(),"imageCode");//页面中字段定义的name是imageCode
        if (StringUtils.isBlank(codeInRequest)){
            throw new ValidateCodeException("验证码的值不能为空");
        }
        if (codeInSession == null){
            throw new ValidateCodeException("验证码不存在");
        }
        if (codeInSession.isExpired()){
            sessionStrategy.removeAttribute(request,ValidateCodeController.SESSION_KEY);
            throw new ValidateCodeException("验证码已过期");
        }
        if (!StringUtils.equals(codeInSession.getCode(),codeInRequest)){
            throw new ValidateCodeException("验证码不匹配");
        }
        sessionStrategy.removeAttribute(request,ValidateCodeController.SESSION_KEY);
    }

    public AuthenticationFailureHandler getAuthenticationFailureHandler() {
        return authenticationFailureHandler;
    }

    public void setAuthenticationFailureHandler(AuthenticationFailureHandler authenticationFailureHandler) {
        this.authenticationFailureHandler = authenticationFailureHandler;
    }
    public SecurityProperties getSecurityProperties() {
        return securityProperties;
    }

    public void setSecurityProperties(SecurityProperties securityProperties) {
        this.securityProperties = securityProperties;
    }
}
